Tommy try FSX SP2 it may help.
I get no blue lights is there a hidden switch
Post the light section from your aircraft.cfg.
Check to see if you have fx_navblu.fx in your Effects folder. No hidden switches, the "formation" light switch is on the main panel. You can also just press "L" (once or twice) to light up the whole plane as a quick and dirty check.
Can I uninstall SP2 if I don't like it? Or am I stuck with it once I install it?
[lights]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
light.0 = 3, -18.90, -116.71, 0.40, fx_navredh
light.1 = 3, -18.90, 116.71, 0.40, fx_navgreh
light.2 = 7, -15, -71, 2.3, fx_navblu
light.3 = 7, -15, 71, 2.3, fx_navblu
light.4 = 7, -15, 87, 2.2, fx_navblu
light.5 = 7, -15, 103, 2, fx_navblu
light.6 = 7, -15, -87, 2.2, fx_navblu
light.7 = 7, -15, -103, 2, fx_navblu
light.8 = 7, -25, 0, 4, fx_navblu
light.9 = 7, -19, 0, 4, fx_navwhih
light.10 = 7, -13, 0, 4, fx_navblu
light.11 = 7, -7, 0, 4, fx_navblu
light.12 = 7, -89.8, 3.5, 1.27, fx_navamb
light.13 = 3, -89.85, -3, 1.27, fx_navwhih
light.14 = 7, -89.8, -3.5, 1.27, fx_navamb
light.15 = 3, -89.85, 3, 1.27, fx_navwhih
light.16 = 3, 4.3, 0, -10.2, fx_navwhih
light.17 = 4, 61.35, -1.98, 2.70, fx_ALPHA_B36_vclight
light.18 = 4, 61.35, 1.98, 2.70, fx_ALPHA_B36_vclight